var msg =["userName","age","sex"];
var stdin = process.stdin;//一个对象
var index = 0;
var infor =[];

console.log(msg[0] + ":");

stdin.on("data",function(chunk){
    var str = chunk.toString("utf-8");
    infor[index] = str;
    index++;
    if(index==3){
        console.log(infor);
        process.exit();
    }
    console.log(msg[index] + ":");
})